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Retriever trainer launchers have been around forever. The problem for me was always the electronics. Thirty years ago I thought of mounting two on a platform, just could never figure out the remotes. To say I was happy when BB introduced there's is an understatement.

John Lash

"If you run Field Trials, you learn to swallow your disappointment quickly."

"Field trials are not a game for good dogs. They're for great dogs with great training." E. Graham

Retriever trainer launchers have been around forever. The problem for me was always the electronics. Thirty years ago I thought of mounting two on a platform, just could never figure out the remotes. To say I was happy when BB introduced there's is an understatement.

My late father built two 4-shooters in the early 70's that we used for years. He designed communication satellites and tracking stations for NASA so if he could control a satellite in space why not throw a bumper in a field. An additional bi-product of the space program.
The remotes were model airplane remotes. The receiver batteries of the era were large (about 6"x4"x2"). Each unit weighed about 15lbs.
I still have the units but like John like my Bumper Boys.

some of you guys are pretty creative, and not to take away from the designs, But so far it seems like the launchers are "holders" for hand held launchers. Has anybody built one from scratch?

The handheld launchers are inexpensive enough and the design tested for safety that it does not make sense to try to make them. The blanks have so much power that someone could get hurt if it came apart. That said, it would be pretty easy to make one if you have a metal lathe and some skills.

I have thought about making a spring loaded bumper catapult to throw multiple standard bumpers. Weight and safety are concerns, however.